I have a development board with CC430F5137 microcontroller and I'm trying to set up RTC module in calendar mode.
I want to switch a first LED every second with read ready interrupt and a second LED every minute with time event interrupt.
The ACLK is already set by default to 32.760 kHz and divided providing 1 second intervals. (I tried it with other codes and it works).
The time event is already set by default to "minute changed".
The code is very simple but it doesn't work. I tried to read RTCSEC (seconds register) with debug mode but it doesn't change.
This is the code, thank you
#include "cc430x513x.h"
int main(void)
{
WDTCTL = WDTPW | WDTHOLD; // Stop Watchdog Timer
// Set up LEDs (P1.0 and P3.0)
P1OUT &= ~BIT0;
P1DIR |= BIT0;
P3OUT &= ~BIT0;
P3DIR |= BIT0;
// Set up RTC
RTCCTL0 |= RTCTEVIE + RTCRDYIE; // Enable RTC time event and read ready interrupts
RTCCTL1 |= RTCBCD + RTCHOLD + RTCMODE; // BCD mode, RTC hold, calendar mode
RTCYEAR = 0x2021; // Year = 2021
RTCMON = 0x06; // Month = June
RTCDAY = 0x02; // Day = 2
RTCDOW = 0x03; // Day of week = Wednesday
RTCHOUR = 0x10; // Hour = 10
RTCMIN = 0x32; // Minute = 32
RTCSEC = 0x45; // Seconds = 45
RTCCTL1 &= ~RTCHOLD; // Start RTC
__bis_SR_register(LPM3_bits + GIE); // Enter LPM3 mode with interrupts enabled
}
#pragma vector = RTC_VECTOR
__interrupt void RTC_ISR(void)
{
switch(__even_in_range(RTCIV, 16))
{
case 0: break; // No interrupt pending
case 2: // RTC ready (RTCRDYIFG)
P1OUT ^= BIT0;
break;
case 4: // RTC interval timer (RTCTEVIFG)
P3OUT ^= BIT0;
break;
case 6: break; // RTC user alarm (RTCAIFG)
case 8: break; // RTC prescaler 0 (RT0PSIFG)
case 10: break; // RTC prescaler 1 (RT1PSIFG)
case 12: break; // Reserved
case 14: break; // Reserved
case 16: break; // Reserved
default: break;
}
}
